Justus Sheffield, the Yanks' top pitching prospect, has been placed on the seven-day minor-league disabled list.

The 21-year-old lefty was removed from his start at Triple-A Scranton on Friday night after 3.2 innings with shoulder stiffness.

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Before the move was announced, Boone had said he'd been given no update on "what the level of concern is down there or the severity" of the injury. But RailRiders manager Bobby Mitchell told reporters that he was hopeful Sheffield only would miss one start.

HOT AND COLE

Reliever A.J. Cole hadn't pitched since April 28 in Anaheim, but after walking the first two batters he faced in the 10th, he completed two scoreless innings, striking out four to earn his first pinstriped win.

Justus Sheffield (Elsa/Getty Images)

"That's a tough spot we put him in…To go out and walk the first two batters, it's almost understandable," Boone said. "To be able to not flinch, stay poised and make pitches through a tough part of their lineup…great effort by him. Really proud of him, especially considering he just hasn't had the work to have a chance to even be sharp."

VISION QUEST

Brandon Drury (migraines, blurred vision) donned yellow-tinted glasses during Friday's doubleheader for Scranton to aid his night vision and belted a grand slam in the second game.

"It's something that he requested, the yellow frames that brighten things up in the evening," Boone said. "I think the things he's doing treatment-wise are more of the things that hopefully are more of a long-term solution. But hopefully it's something that he can get comfortable with and maybe something that can help him along."

WHAT A RELIEF

Rehabbing relievers Tommy Kahnle (shoulder) and Adam Warren (back) will report to Tampa on Sunday, Boone said. Kahnle appears closer to returning and might rejoin the Yanks before the end of the upcoming eight-game road trip. Warren will throw his first bullpen session since going on the DL on Monday in Tampa.